Piranha is a general name used to describe a group of freshwater fish with a fearsome reputation when it comes to feeding. There are between 40 and 60 different species; none grow larger than two feet ...

Once the lights went down, the gulper catfish came out of hiding. Using a GoPro inside the tank, this clip captures the raw moment predator fish leave their caves, coordinate, and strike live prey in ...

Betta, or Siamese fighting, fish are among "the most popular freshwater aquarium fish in the world," PetMD reports. Native to southeast Asia, this species is known for its range of vibrant hues. There ...